84 PALEONTOLOGY OF NEW YORK. 



ticulntions, more closely arranged monticules, the space at their centers being 

 without cell apertures. 



Formation and locality. Upper Helderberg group, Falls of the Ohio river. 



LiCHENALIA (PiLEOTRYPA) GRANIFERA. 



PLATE XXX, FIGS. 28-31. 



JUdtatdlia groH^fera, Hall. Trani). Albany Institute, vol. x, abstract, p. II. 1881. 

 " (PUeotrypa) granifera. Report of State Geologist for 1885, advance sheets. Expl. pi. 30, figs. 



28-31. 188«. 



ZoARiuM consisting of lamellate expansions, greatest thickness observed 1.50 

 mm. Cell tubes at right angles to the surface, often with frequent constric- 

 tions ; septa occurring at short intervals. Cell apertures ovate, length .35 

 mm., width from one-half to two-thirds the length ; closely and irregularly 

 disposed. Anterior margin of peristome thin and slightly elevated ; posterior 

 portion strongly elevated ; denticulations slight or wanting. Maculae destitute 

 of cell apertures, distant from each other 5 mm., diameter 1.50 mm. ; the 

 cells immediately adjacent radiate from them, and are larger than the others. 

 Intercellular space regularly septate. Surface granulose. 



This species may be distinguished by the constrictions of the cell tubes, the 

 ovate cell apertures, with strong posterior margins without denticulations, and 

 the granulose surface. 



Formation and locality. Upper Helderberg group, Falls of the Ohio river. 



LiCHENALIA (PiLEOTRYPA) DENTICULATA. 

 PLATE XXVI, FIGS. 21, 22, W; anb PLATE XXX, FIGS. 12-20. 



Licbenalia denticulaia. Hall. Trans. Albany Institute, vol. x, abstract, p. 8. 1881. 



Report of State Geologist for 1882, Expl. pi. 24, figs. 21, 22, 26. 1883. 

 '• (PUeotryya) denliculata. Repoi-t of State Geologist foi- 188."), advance sheets. Expl. pi. 30, 



figs. 12-20. 1886. 

 Compare Eridopora minima, Ulbich. Cont. Am. Pal., vol. i. No. 1, p. 21, pi. 2, fig. G, 6a. 1886. 



Zoarium consisting of thin lamellate expansions, encrusting other objects. Cell 

 apertures trilobate, length .25 mm. ; crowded and irregularly disposed. 

 Anterior margin of peristome slightly elevated; posterior portion denticulate 



